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utf8 to hex macro

I would like to replace utf8 characters to byte values for easier character display handling. The actual replacement table comes from the lcd datasheet therefore it is not utf8 to ascii conversion. Hence I would like to define some macros, where I put the utf8 character, and it returns some matching hex code.

Here is the bare minimum code:

#define IV('┌') 0xC9
#define IV('°') 0xB2
char line0[4] = {0xC9, '4', 0xB2, 0}; // works
char line1[4] = {IV('┌'), '4', IV('°'), 0}; // do not work
void setup() {}
void loop() {}

It does not compile and I must be missing something obvious or rather basic. Any help is much appreciated.

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Macros can give weird errors is you do not parenthesize them properly. Here, you have lots of useless parentheses, yet the ones that would be needed to make the macro safe are missing. With only the required parentheses it would look like: #define IV(i) ((i)=='┌' ? 0xc9 : (i)=='⎩' ? 0x15 : (i)=='⎭' ? 0x17 : (i)=='⎰' ? 0x18 : (i)=='°' ? 0xb2 : (i)=='TM' ? 0xd0 : (i)=='Ξ' ? 0xd8 : (i))

Edgar Bonet
– Edgar Bonet

2020年12月20日 20:12:02 +00:00
Commented Dec 20, 2020 at 20:12
@EdgarBonet ty, corrected.

user12933
– user12933

2020年12月20日 20:24:07 +00:00
Commented Dec 20, 2020 at 20:24

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